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The moon cycle is approx 28 days, which is 7x4.

The height of tides are rooted in this but have 7 day periods of increasing, decreasing, increasing, decreasing.

I don't know if thats reason enough to continue with it, but possibly part of the history

This is a pretty common approximation, but the average lunation is closer to 29.5 days.

That’s really a strong reason, is it not? I have no idea for how long humanity has tracked the seven day week, but suspect it’s been well over 2000 years.

That’s a lot of tradition to discard.

Goes all the way back to the Babylonians, 4000 years ago, at least

7 days for the moon to go in half a cycle. Full to half. New moon to half moon. A pretty good demarkation of a period of time between one day and a month (full lunar cycle).

Alot of religions kinda use the week for weekly prayer (all Abrahamic religions) so you kinda stuck with it since you need to take that into account

Yeah, momentum. I can't think of what authority would be able to change it and make it be globally followed. A tradition of thousand years, with roots in religious texts. I don't think it is within anyone's power to change it.